A group of three to five people broke into the station, killed two guards and assaulted two workers before planting explosives on the premises, the Investigative Committee of the Prosecutor General’s Office said today on its website. Four devices detonated and a fifth was defused, investigators said

The 74-year-old, 25-megawatt station will be shut for “at least six weeks to two months. Two turbines out of three were damaged by the blast, said Oleg Grekov, a spokesman for the Emergency Ministry in Rostov- on-Don. A fire at the plant has been extinguished, he said.

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